The primary objective is to determine the safety and tolerability of hLL2 in patients with SLE. In addition to safety data, clinical and laboratory data will also be collected for preliminary evaluation of the effectiveness of hLL2 in SLE and to assess the effect of hLL2 on B and T lymphocytes in the lymphoid organs and the peripheral blood. If the treatment is safe and there is preliminary evidence of efficacy, this regimen could be used in controlled trials in the future.